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manpage: update --hwdec description

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vdpaurb, vaapi-glx, and ANGLE's NV12-restriction are gone, making things
much simpler.
This commit is contained in:
wm4 2019-10-17 11:10:40 +02:00
parent bd0af9a761
commit e49db40382
1 changed files with 7 additions and 16 deletions

23
DOCS/man/options.rst
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@ -1040,23 +1040,14 @@ Video
cases, hardware decoding can also reduce the bit depth of the decoded
image, which can introduce banding or precision loss for 10-bit files.
``vdpau`` is usually safe. If deinterlacing enabled (or the ``vdpaupp``
video filter is active in general), it forces RGB conversion. The latter
currently does not treat certain colorspaces like BT.2020 correctly
(which is mostly a mpv-specific restriction). The ``vdpauprb`` video
filter retrieves image data without RGB conversion and is safe (but
precludes use of vdpau postprocessing).
``vdpau`` is usually safe, exycept for 10 bit video. If deinterlacing
enabled (or the ``vdpaupp`` video filter is active in general), it
forces RGB conversion. The latter currently does not treat certain
colorspaces like BT.2020 correctly.
``vaapi`` is safe if the ``vaapi-egl`` backend is indicated in the
logs. If ``vaapi-glx`` is indicated, and the video colorspace is either
BT.601 or BT.709, a forced, low-quality but correct RGB conversion is
performed. Otherwise, the result will be totally incorrect.
``d3d11va`` is safe when used with the ``d3d11`` backend. If used with
``angle`` is it usually safe, except that 10 bit input (HEVC main 10
profiles) will be rounded down to 8 bits, which will result in reduced
quality. Also note that with very old ANGLE builds (without
``EGL_KHR_stream path``,) all input will be converted to RGB.
``vaapi`` and ``d3d11va`` are safe. Enabling deinterlacing (or simply
their respective post-processing filters) will possibly at least reduce
color quality by converting the output to a 8 bit format.
``dxva2`` is not safe. It appears to always use BT.601 for forced RGB
conversion, but actual behavior depends on the GPU drivers. Some drivers